looking for a good 3d printer

[A_Camera]

I'd look at a rapsiberry pi solution, cheap as chips and can add 4" colour touch screen for a £10

As for 24v
The difference you will notice giving the nema's 24v is not like with nema 23's lol, you'll get 30% more torque but in the real world it will make almost no difference.

But the heated bed you will notice the difference I would just get a cheap mk3 aluminium heated bed, they work well at 24v and heat up in less than 2 mins, at 12v it can take over 10 mins! If you're only printing PLA I find at 12v the bed will heat to 60c in a couple of mins but to get to 110c at 12v takes forever! So 24v makes much more difference when printing ABS.

The higher voltage on the steppers is mainly for speed not the torque. I think it makes a difference there.